Ring/Redundant Topology; Recommended Design Rules; Mounting - Danfoss VLT BACnet/IP MCA 125 Installation Manual

Installation

3.5.1.3 Ring/Redundant Topology

3 3
Illustration 3.4 Ring/Redundant Topology
Ring topology can increase the availability of an Ethernet
network.
For ring topology:
•
Install a special switch (redundancy manager)
between the BMS controller and the frequency
converters.
•
Configure the redundancy manager switch to
clearly define the ports that connect to the ring.
When the ring is closed, the main redundancy manager
tests the ring for detects. If the redundancy manager
detects a fault in the ring, it reconfigures the ring into 2
lines instead. The transition time from ring topology into 2
lines can vary from 200 ms up to several seconds
depending on the components installed in the ring. Set
the timing of the BMS controller to ensure that the
transition time does not lead to a timeout fault.
NOTICE
For ring/redundant topology, ensure that the redundancy
manager switch supports the detection of loss of line
topology. The switch inside the BACnet/IP interface does
not support this detection, as the redundancy manager
has to perform this task.
8
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VLT BACnet/IP MCA 125

3.5.1.4 Recommended Design Rules

•
•
•
Illustration 3.5 Recommended Design Rules

3.6 Mounting

1.
2.
3.
4.
5.
6.
Danfoss A/S © 05/2016 All rights reserved.
Pay special attention to active network
components when designing an Ethernet
network.
For line topology, a small delay is added with
each additional switch in the line. For more
information, see Table 3.1.
Do not connect more than 32 frequency
converters in series. To prevent unstable or faulty
communication, set the timing, if this limit is
exceeded.
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Max. 32 drives
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Check whether the fieldbus option is already
mounted in the frequency converter. If the option
is already mounted, go to step 6.
Remove the LCP or blind cover from the
frequency converter.
Use a screwdriver to remove the front cover and
the LCP cradle.
Mount the fieldbus option with the Ethernet port
facing upwards for top cable entry (see
Illustration 3.7), or with the Ethernet port facing
downwards for bottom cable entry (see
Illustration 3.8).
Remove the knockout plate from the new LCP
cradle.
Mount the new LCP cradle.
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MG92K102